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Hour 11. Layers > Working with Multiple Layers

Working with Multiple Layers

You have seen how to create, move, and remove layers, but we still haven't really addressed the question of what they're good for. You will use layers in many different situations. Whenever you are combining two or more images (in Photoshop terms, compositing), the elements you paste over the background image are added on separate layers. You can use the Layer palette to control precisely how these elements are combined. You can control the opacity of objects you paste onto a layer or paint that you apply to it. (The layer itself is transparent, even if you set the paint on it to 100% opacity). You can also control the Blending modes that affect how one layer appears on top of another, just as you could when painting over an image or background.

Opacity

The Opacity slider at the top of the Layers palette controls the opacity of the active layer (see Figure 11.11). Make it active by clicking the triangle to the right of the percentage window. It can be adjusted from 0–100% by dragging the slider. If you'd rather not access the slider, enter a value by typing 0 for 100%, 1 for 10%, 2 for 20%, and so on. If you desire more precise control, simply type the digits of the measurement you desire (57, for instance) in quick succession.


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